The central powers were conformed by Austria, Hungary, Bulgaria, German, and Ottoman Empire during the first world war. There was several motives for the defeat of the central powers:
1. The failure of the Schlieffen plan. This plan consisted on sending forces belonging to Germany through Belgium in order to attack France.
2. The use of trenches warfare.
3. The entering of USA to the war.
4. The change of leadership in Britain and France.
5. Germans were defeated in the air war.
6. The German spring offensive AKA Ludendorff offensive.
7. The new united military leadership in 1918.
8. The collapse of Germany's allies.